Check out Wikipedia's Comparison of e-book readers for further information
Kindle: .arg, .azw(Amazon's File Format), .html, .mp3, .txt, .rtf, .pdf
Nook: .epub, .pdb, .pdf, .gif, .jpg, .png, .bmp
Tablet: Most file formats are compatible with tablets at long as the correct App is downloaded to the tablet.
For problems encountered with ebooks, it is usually best to contact the library first. We can often troubleshoot or advise quickly.
Common problems with library e-books: